This is the spikey, terrifying skull of a Corythomantis greeningi frog. Look at those venom-delivering spikes!

Scientists have known about the frogs for a while, but only recently learned about the venom spikes the hard way.

According to a press release, researcher Carlos Jared had an unfortunate encounter with one of the frogs that led to the discovery:

"Unfortunately for Jared, he first realized that C. greeningi might be venomous firsthand while collecting frogs for research. His hand was injured by one of the frog's spines, which led to intense, radiating pain for a period of about 5 hours."